GB2052325A - Multi-cutter drilling bit tool - Google Patents

Multi-cutter drilling bit tool Download PDF

Info

Publication number
GB2052325A
GB2052325A GB8020522A GB8020522A GB2052325A GB 2052325 A GB2052325 A GB 2052325A GB 8020522 A GB8020522 A GB 8020522A GB 8020522 A GB8020522 A GB 8020522A GB 2052325 A GB2052325 A GB 2052325A
Authority
GB
United Kingdom
Prior art keywords
bit
face
blocks
cutting material
chips
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8020522A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB8020522A priority Critical patent/GB2052325A/en
Publication of GB2052325A publication Critical patent/GB2052325A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/75—Stone, rock or concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/02—Connections between shanks and removable cutting heads

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

A drilling tool bit especially for use in taking core samples, has a hollow body 1 on one end face of which are disposed rough-surfaced blocks 4 of cutting material such as tungsten carbide. The blocks are spaced from one another around the end face of the bit and if desired the leading edges of the blocks can be reinforced by providing across them tungsten carbide slugs 5. <IMAGE>

Description

SPECIFICATION Drilling tool bit This invention relates to a drilling tool bit.
According to the present invention there is provided a drilling tool bit having a hollow body for connection to a drilling tool, the body having an end face from which extend spaced upstanding blocks of cutting material having non-planar outer surfaces.
Preferably a strengthening member is provided at the intended leading edge of each block of the cutting material. Preferably also the strengthening members are of wear-resistant material and may be for example flats, or slugs, or tungsten carbide. The strengthening members preferably extend at least as far as the lateral edges of the block. The strengthening members may be brazed or otherwise secured to the body.
The blocks of cutting material may have their leading edges disposed on a stepped portion of the end face so as to increase the cutting effect on rotation of the body. In this respect the end face may be alternately stepped and tapered around its periphery so that the stepped portions are at the same height, the tapered portions returning the level of the end face to the bottom of the next step.
The body may be screw-threaded as with conventional tool bits for connection to a drilling tool, and is preferably cylindrical.
The body is preferably generally cylindrical and open-ended for fitment to a standard tool, and the bit of this invention is for especial use in taking core samples.
As a general rule it has been found that optimum results can be obtained when the ratio of the number of blocks of cutting material to the circumference of the body in inches is about 1:3, and when the blocks of cutting material extend about a inch from the end face of the body. The blocks are preferably equispaced. Thus for example with a cylindrical body 4- inch diameter (26 inch circumference) eight blocks of cutting material are provided equally spaced around the periphery of the end face. 12 blocks would be provided on a 36 inch circumference body.
Preferably the blocks of cutting material are separated from one another by apertures in the end face for passage of air.
An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a side sectional view of a tool bit of this invention; and Figure 2 is a plan view of the tool bit of Figure 1.
The tool bit of the illustrated embodiment of the invention has a body formed from mild steel tube 148 inches in diameter screw-threaded at one end 2 for connection to a drill (not shown). An annular mild steel end cap 3 is welded onto the other end face of the tube 1 and has secured to its outer end face a series of eight spaced generally cuboidal tungsten carbide chips 4 in crystalline form presenting a rough and hard cutting surface for the bit. At the leading edge of each of the chips 4 there is set in and brazed to the cap 3 a tungsten carbide flat 5 measuring 9/16" x 5/16" x 1/8". These flats 5 extend laterally slightly beyond the extremities of the chips 4.
The outer end face of the cap 3 carrying the chips 4 is alternately stepped and tapered a shown in Figure 1, and the flats 5 form the leading edge of the steps with the chips 4 disposed above them so that the effective cutting face on rotation of the body is formed by the chips 4 and flats 5.
Ports 6 are provided in the end cap 3 between the chips 4 and open into the central space of the tube 1 through bevelled openings 7.
The overall length of the tube 1 and cap 3 is about seven inches.
In use, the tool bit is screwed on the free end of a drill and placed against material which is to be drilled. The drill is then rotated, causing the bit to rotate about its main axis and so that the chips 4 follow one another in circular motion. As the drill is advanced longitudinally, the chips 4 wear through the material being drilled, and in so doing the flats 5 and leading edges of the chips 4 contact the material, presenting a very hard and wear-resistant face to it.
The peripheral speed of the bit can be from 1 to 10 feet per second for best effect.
The drilling effectiveness is very great by virtue of the spaced relation of the chips 4 as the leading edges present sharp edges disposed generally at right angles to the direction of attack on the material.
In prior proposed drill bits where the cutting material is disposed around the entire periphery of the bit instead of in discrete chips the cutting action is less effective and the top surface of the cutting material tends to become smooth.
In this embodimen of the invention the chips 4 are provided on the tube 1 by welding, the welding rod itself being tungsten carbide.
The bit of this embodiment is effective in a wide range of materials to be drilled, and can be used to produce a good quality core of 3" diameter in for example, clay, soft shell, shale, micaceous shell, fireclay, soft sandstone, medium to hard sandstone, limestone, whinstone, mudstone and coal. It give a high degree of quality and performance at lost cost, and its penetration rates compare favourably with previously proposed bits. The cost per metre drilled is lower than existing bits.
1. A drilling tool bit having a hollow body for connection to a drilling tool, the body having an end face from which extend spaced upstanding blocks of cutting material having non-planar outer surfaces.
2. A bit according to claim 1, wherein the body is generally cylindrical and open-ended.
3. A bit according to claim 2, wherein the ratio of the number of blocks of cutting material to the circumference of the body in inches is about 1:3.
4. A bit according to claim 1, 2 or 3, wherein the blocks of cutting material extend about 41 inch from the end face of the body.
5. A bit according to any one of the preceding claims, wherein the blocks of cutting material are
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Drilling tool bit This invention relates to a drilling tool bit. According to the present invention there is provided a drilling tool bit having a hollow body for connection to a drilling tool, the body having an end face from which extend spaced upstanding blocks of cutting material having non-planar outer surfaces. Preferably a strengthening member is provided at the intended leading edge of each block of the cutting material. Preferably also the strengthening members are of wear-resistant material and may be for example flats, or slugs, or tungsten carbide. The strengthening members preferably extend at least as far as the lateral edges of the block. The strengthening members may be brazed or otherwise secured to the body. The blocks of cutting material may have their leading edges disposed on a stepped portion of the end face so as to increase the cutting effect on rotation of the body. In this respect the end face may be alternately stepped and tapered around its periphery so that the stepped portions are at the same height, the tapered portions returning the level of the end face to the bottom of the next step. The body may be screw-threaded as with conventional tool bits for connection to a drilling tool, and is preferably cylindrical. The body is preferably generally cylindrical and open-ended for fitment to a standard tool, and the bit of this invention is for especial use in taking core samples. As a general rule it has been found that optimum results can be obtained when the ratio of the number of blocks of cutting material to the circumference of the body in inches is about 1:3, and when the blocks of cutting material extend about a inch from the end face of the body. The blocks are preferably equispaced. Thus for example with a cylindrical body 4- inch diameter (26 inch circumference) eight blocks of cutting material are provided equally spaced around the periphery of the end face. 12 blocks would be provided on a 36 inch circumference body. Preferably the blocks of cutting material are separated from one another by apertures in the end face for passage of air. An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a side sectional view of a tool bit of this invention; and Figure 2 is a plan view of the tool bit of Figure 1. The tool bit of the illustrated embodiment of the invention has a body formed from mild steel tube 148 inches in diameter screw-threaded at one end 2 for connection to a drill (not shown). An annular mild steel end cap 3 is welded onto the other end face of the tube 1 and has secured to its outer end face a series of eight spaced generally cuboidal tungsten carbide chips 4 in crystalline form presenting a rough and hard cutting surface for the bit. At the leading edge of each of the chips 4 there is set in and brazed to the cap 3 a tungsten carbide flat 5 measuring 9/16" x 5/16" x 1/8". These flats 5 extend laterally slightly beyond the extremities of the chips 4. The outer end face of the cap 3 carrying the chips 4 is alternately stepped and tapered a shown in Figure 1, and the flats 5 form the leading edge of the steps with the chips 4 disposed above them so that the effective cutting face on rotation of the body is formed by the chips 4 and flats 5. Ports 6 are provided in the end cap 3 between the chips 4 and open into the central space of the tube 1 through bevelled openings 7. The overall length of the tube 1 and cap 3 is about seven inches. In use, the tool bit is screwed on the free end of a drill and placed against material which is to be drilled. The drill is then rotated, causing the bit to rotate about its main axis and so that the chips 4 follow one another in circular motion. As the drill is advanced longitudinally, the chips 4 wear through the material being drilled, and in so doing the flats 5 and leading edges of the chips 4 contact the material, presenting a very hard and wear-resistant face to it. The peripheral speed of the bit can be from 1 to 10 feet per second for best effect. The drilling effectiveness is very great by virtue of the spaced relation of the chips 4 as the leading edges present sharp edges disposed generally at right angles to the direction of attack on the material. In prior proposed drill bits where the cutting material is disposed around the entire periphery of the bit instead of in discrete chips the cutting action is less effective and the top surface of the cutting material tends to become smooth. In this embodimen of the invention the chips 4 are provided on the tube 1 by welding, the welding rod itself being tungsten carbide. The bit of this embodiment is effective in a wide range of materials to be drilled, and can be used to produce a good quality core of 3" diameter in for example, clay, soft shell, shale, micaceous shell, fireclay, soft sandstone, medium to hard sandstone, limestone, whinstone, mudstone and coal. It give a high degree of quality and performance at lost cost, and its penetration rates compare favourably with previously proposed bits. The cost per metre drilled is lower than existing bits. CLAIMS
1. A drilling tool bit having a hollow body for connection to a drilling tool, the body having an end face from which extend spaced upstanding blocks of cutting material having non-planar outer surfaces.
2. A bit according to claim 1, wherein the body is generally cylindrical and open-ended.
3. A bit according to claim 2, wherein the ratio of the number of blocks of cutting material to the circumference of the body in inches is about 1:3.
4. A bit according to claim 1, 2 or 3, wherein the blocks of cutting material extend about 41 inch from the end face of the body.
5. A bit according to any one of the preceding claims, wherein the blocks of cutting material are equispaced around the periphery of the end face of the body.
6. A bit according to any one of the preceding claims, wherein the spaced blocks of cutting material alternate with apertures in the end face for passage of air.
7. A bit according to any one of the preceding claims, wherein the cutting material is tungsten carbide.
8. A bit according to any one of the preceding claims, wherein a strengthening member is provided along the leading edge of each block of cutting material with reference to the intended direction of rotation of the bit.
9. A bit according to claim 8, wherein the strengthening member extends at least as far as the lateral edges of the block.
10. A bit according to claim 8 or 9, wherein the strengthening members are slugs of cutting material.
11. A bit according to any one of the preceding claims, wherein the end face of the body is stepped at intervals around its periphery, and the blocks of cutting material are disposed with their leading edges co-terminous with respective steps with refer ence to the intended direction of rotation of the bit.
12. A drilling tool bit substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
13. A drilling tool having a bit according to any one of the preceding claims.
GB8020522A 1979-07-03 1980-06-23 Multi-cutter drilling bit tool Withdrawn GB2052325A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8020522A GB2052325A (en) 1979-07-03 1980-06-23 Multi-cutter drilling bit tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7923163 1979-07-03
GB8020522A GB2052325A (en) 1979-07-03 1980-06-23 Multi-cutter drilling bit tool

Publications (1)

Publication Number Publication Date
GB2052325A true GB2052325A (en) 1981-01-28

Family

ID=26272053

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8020522A Withdrawn GB2052325A (en) 1979-07-03 1980-06-23 Multi-cutter drilling bit tool

Country Status (1)

Country Link
GB (1) GB2052325A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2529504A1 (en) * 1982-06-30 1984-01-06 Onera (Off Nat Aerospatiale) Tool and method for the accurate cutting of cylindrical parts made in porous or alveolate elastic materials.
WO1990015683A1 (en) * 1989-06-14 1990-12-27 Tyrolit Schleifmittelwerke Swarovski K.G. Hollow drill
US5069584A (en) * 1989-01-20 1991-12-03 Hilti Aktiengesellschaft Hollow drilling tool

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2529504A1 (en) * 1982-06-30 1984-01-06 Onera (Off Nat Aerospatiale) Tool and method for the accurate cutting of cylindrical parts made in porous or alveolate elastic materials.
US5069584A (en) * 1989-01-20 1991-12-03 Hilti Aktiengesellschaft Hollow drilling tool
WO1990015683A1 (en) * 1989-06-14 1990-12-27 Tyrolit Schleifmittelwerke Swarovski K.G. Hollow drill

Similar Documents

Publication Publication Date Title
CA2208313C (en) Improved segmented cutting tools
US4323130A (en) Drill bit
US4558975A (en) Drill with disposable inserts
US4442909A (en) Drill bit
HU9501624D0 (en) Drillbit for working stone
US4966502A (en) Hollow drilling tool
US3712392A (en) Diamond drill assembly with bore hole support
US4324300A (en) Rotary drill bit
US2262001A (en) Drill bit
US4078622A (en) Road surface recessing device
US3918538A (en) Rotary percussion earth boring bit
GB2052325A (en) Multi-cutter drilling bit tool
US6588520B2 (en) Rock drill
US4299297A (en) Rotary percussion bit
SU1305295A1 (en) Roller bit
US2209079A (en) Tool
US2203216A (en) Drill bit
US2166478A (en) Drill bit
SU799956A1 (en) Segmented diamond drill
US2174791A (en) Drill bit
RU1803518C (en) Diamond drill bit
SU810935A1 (en) Hole-bottom milling cutter
US2109390A (en) Drill bit
SU901505A2 (en) Rock breaking tool
US2753155A (en) Drill bit

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)